The low speed is the design exhaust rate, and the high speed is a typical 50% increase.Ī typical science classroom lab of 1400 square feet and a 9 foot ceiling would then have a low speed exhaust fan sized at a minimum of 1400 CFM with a high speed of 2100 CFM. Previous DBR designs have been based on sizing the exhaust for the science classroom/lab and providing a fan that is two speed to serve the area. Since the modern codes are based on ASHRAE Standard 62.1-2010 and this calls for a minimum of 1 CFM per square foot of educational science laboratories, the intent of the TAC is already met by the normal exhaust requirements. A stand alone high school chemistry lab is required to have a minimum of 1,000 square feet.įor the combination science classroom/lab with an assumed 9 foot ceiling height, the minimum exhaust rate called for at 4 ACH would result in a requirement for 840 CFM of exhaust. A high school combination science classroom and lab is required to have minimum of 1,400 square feet. In section v above, the Texas Administrative Code calls for an exhaust fan, controlled by the instructor, sufficient in size to exhaust the total volume of the room in 15 minutes, or be capable of providing an exhaust rate of 4 ACH.
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